title: Modeling of rifampicin-induced CYP3A4 activation dynamics for the prediction of clinical drug-drug interactions from in vitro data.
abstract: Induction of cytochrome P450 3A4 (CYP3A4) expression is often implicated in clinically relevant drug-drug interactions (DDI), as metabolism catalyzed by this enzyme is the dominant route of elimination for many drugs. Although several DDI models have been proposed, none have comprehensively considered the effects of enzyme transcription/translation dynamics on induction-based DDI. Rifampicin is a well-known CYP3A4 inducer, and is commonly used as a positive control for evaluating the CYP3A4 induction potential of test compounds. Herein, we report the compilation of in vitro induction data for CYP3A4 by rifampicin in human hepatocytes, and the transcription/translation model developed for this enzyme using an extended least squares method that can account for inherent inter-individual variability. We also developed physiologically based pharmacokinetic (PBPK) models for the CYP3A4 inducer and CYP3A4 substrates. Finally, we demonstrated that rifampicin-induced DDI can be predicted with reasonable accuracy, and that a static model can be used to simulate DDI once the blood concentration of the inducer reaches a steady state following repeated dosing. This dynamic PBPK-based DDI model was implemented on a new multi-hierarchical physiology simulation platform named PhysioDesigner.
authors.affiliation: Department of Drug Delivery Research, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan.
authors.forename: Fumiyoshi
authors.initials: F
authors.lastname: Yamashita
authors.forename: Yukako
authors.initials: Y
authors.lastname: Sasa
authors.forename: Shuya
authors.initials: S
authors.lastname: Yoshida
authors.forename: Akihiro
authors.initials: A
authors.lastname: Hisaka
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Asai
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Kitano
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Hashida
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Suzuki
mesh_terms: D000904:Antibiotics, Antitubercular / Q000494:pharmacology*; D002478:Cells, Cultured; D051544:Cytochrome P-450 CYP3A / Q000378:metabolism*; D004347:Drug Interactions; D004789:Enzyme Activation; D022781:Hepatocytes / Q000187:drug effects / Q000201:enzymology; D006801:Humans; D066298:In Vitro Techniques; D008962:Models, Theoretical; D012293:Rifampin / Q000494:pharmacology*
chemical_list: D000904:Antibiotics, Antitubercular; D051544:Cytochrome P-450 CYP3A; C510163:CYP3A4 protein, human; D012293:Rifampin